Herndon was deployed to Iraq in 2008 and Afghanistan in 2009 as a lead machine-gunner in the \"Lava Dogs\" division -- the 1st Battalion, 3rd Marines, based out of Hawaii – Ohio’s Record-Courier reported in a pre-race profile.

Running became \"therapy\" for Herndon after he struggled to reintegrate into civilian life following his tours, he told ABC this spring, and it is a way for him to cope with post-traumatic stress disorder and survivor's guilt.

\"To honor them, because they're not here anymore and they can't run anymore,\" he said. \"Just to honor their names and their family that's still here.\"

He told \"GMA\" that he said his friends' last names aloud, Ballard, Hamer and Juarez, to keep himself motivated while running. Herndon also has special tags on his running shoe laces that have the last names of his friends.

\"GMA\" made Herndon's Monday, along with other marathon finishers, by surprising them with a massage session and gift certificate for gear.

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